Graffiti warns school of possible threat

April 24, 2009 10:22:08 AM PDT

LOS ANGELES --

Graffiti on the bathroom wall at an L.A. Unified school has caused officials to add more security on campus as a precaution on Friday.The Web site for Hamilton High School said someone had scrawled a threat saying there would be an act of violence on campus on Friday, and school officials confirmed the graffiti mentioned a racially motivated incident.

Police did not say what the graffiti said.

Classes are continuing as normal without interruption.

LAUSD school police are providing the primary security on campus, with LAPD as backup and support.